Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 11, Problem 4SQ
Refer to the circuit in Figure 11–10. What is the purpose of control relay CR in this circuit?
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a. Draw the relationship between excitation current and short circuit, and Please explain.
b. At what volts is the alternator end voltage short-circuited? At nominal voltage What will happen if a short circuit is made?
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- What is the role of relays in power system protection, and how do they work to prevent faults?arrow_forwardAn X1 volt,(122V) relay has an inrush rating of 700VA and a hold-in rating of 150VA. Note X1=122V Determine, 1) the hold-in current and, 2) the inrush current.arrow_forwardChoose the right answer. 1. The basic elements in any power system are 2. The reactors have the following problems 3. If a fault occurred between phases (A, B, and C) simultaneously the fault is called if the fault occurred on phase (A) only or phases (A, B), it may take the following types and ...... where or 4. The symmetrical component method is 5. Conditions for succesful operation of a power system are 6. The reason we use the numerical methods in load flow analysis is 7. The main diagonal of Y-bus numbers by a factor / not any) 8. The properties of the fault currents and (changes the signs / keeps the signs / multiplies the .... .... ....... rearrow_forward
- B: Relay is consist two circuits, what they are? And determine whether the next relay is normally open or normally closed. 3arrow_forwardWhich of the statement is true? A Normally closed (NC) relay contact is open when the relay coil is de – energized. It opens when the coil energizes, but returns to closed position when the coil de – energizes. O b. When a relay contact is normally open (NO), there is an open contact when the relay is energized. O c. A NO relay contact is open when the relay coil is de – energized. It closes when the coil energizes but returns to open position when the coil de – energizes. d. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is energized.arrow_forwardList two Loop (PLL) in important uses. of phase locked analog Communication System.arrow_forward
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